The actual Day is 24 October, when each year, the Organizsation reaffirms the purposes and principles that have guided it for the past 76 years.

UN values of peace, development and human rights ‘have no expiry date’

“Music reflects the profound diversity and unique contributions of cultures around the world”, said UN chief António Guterres, inside the concert venue – the gilded General Assembly Hall. “At the same time, it is universal. A language that bridges all divides”.  

24th October is #UnitedNationsDay!

It marks the anniversary of the day in 1945 when the @UN Charter entered into force. #UNDay, celebrated every year, offers the opportunity to amplify our common agenda and reaffirm the purposes and principles of the #UNCharterpic.twitter.com/zB2011zIlt

— UN Bonn (@UNBonn) October 21, 2021

At a celebratory concert in New York on Thursday night, marking the anniversary of the foundational UN Charter entering into force, the Secretary-General said that the “spirit of solidarity and action” that marks United Nations United Nations Day itself, is “wonderfully expressed in the power of music”.  

SBS Medianet | The 2021 UN Day Concert.

What is the UN?

The United Nations is an international organization founded in 1945. Currently made up of 193 Member States, the UN and its work are guided by the purposes and principles contained in its founding Charter.
The UN has evolved over the years to keep pace with a rapidly changing world.
But one thing has stayed the same: it remains the one place on Earth where all the world’s nations can gather together, discuss common problems, and find shared solutions that benefit all of humanity.


The World We Want – 75 photos curated from more than 50,000 images from over 130 countries in response to the Secretary-General’s call to hear directly from the peoples of the world about their priorities for the future.

Can we end hunger and poverty, halt climate change and achieve gender equality in the next 15 years? The governments of the world think we can. Meeting at the UN in September 2015, they agreed to a new set of Global Goals for the development of the world to 2030.


760 United Nations Plaza
New York City (international territory)


Intergovernmental organization

Official languages



193 member states
2 observer states


• UN Charter signed
26 June 1945 (76 years ago)
• Charter entered into force
24 October 1945 (75 years ago)

Preceded by

League of Nations

Blockchain for Smart Sustainable Cities is the latest deliverable by the initiative United for Smart Sustainable Cities (U4SSC)

2020•12•07 GUIMARÃES

Coordinated by Soumaya Ben Dhaou, UNU-EGOV’s research coordinator, and together with other experts from several organisations, this report explores the current advancement and application of the blockchain technology in smart sustainable cities and across various verticals.

Sustainability solution or climate calamity? The dangers and promise of cryptocurrency technology

June 20, 2021 | Economic development | news.un.org

The negative environmental impact of cryptocurrencies such as Bitcoin has been widely covered in the press in recent weeks and months, and their volatility has also been flagged as a cause for concern. Nevertheless, the UN believes that blockchain, the technology lying behind these online currencies, could be of great benefit to those fighting the climate crisis, and help bring about a more sustainable global economy.